<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
		<title></title>
		<script type="text/javascript">
			var a = 3;
			var b = 7;
			var res = b - a;
			var res = a * b;
			var res = a / b;
			var res = b % a;
//			加号有两个作用,数值的情况是运算,字符串的情况是字符串链接
			var res = a + b;
			var res = '我喜欢' + '熊老师';
			document.write(res);
		</script>
	</head>
	<body>

	</body>
</html>
